The analytical approach to river regime of White et al. (1982) has been analyzed and the validity of the extremal hypothesis has been verified. A modified version of the original method is here proposed in order to improve prediction capability. To this aim, the original trapezoidal cross section has been changed, employing the analytical geometry for stable channel proposed by Cao & Knight (1998). The modified method appears to be still coherent with the extremal hypothesis, and provides better agreement if compared with field and laboratory tests on stable non cohesive straight channels.
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